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From Daniel Yehdego <dtyehd...@miners.utep.edu>
Subject RE: Hadoop-streaming using binary executable c program
Date Mon, 25 Jul 2011 20:37:17 GMT

Good afternoon Bobby, 

Thanks, you gave me a great help in finding out what the problem was. After I put the command
line you suggested me, I found out that there was a segmentation error.
The binary executable program pknotsRG only reads a file with a sequence in it. This means,
there should be a shell script, as you have said, that will take the data coming
from stdin and write it to a temporary file. Any idea on how to do this job in shell script.
The thing is I am from a biology background and don't have much experience in CS.
looking forward to hear from you. Thanks so much.

Regards, 

Daniel T. Yehdego
Computational Science Program 
University of Texas at El Paso, UTEP 
dtyehdego@miners.utep.edu

> From: evans@yahoo-inc.com
> To: common-user@hadoop.apache.org
> Date: Fri, 22 Jul 2011 12:39:08 -0700
> Subject: Re: Hadoop-streaming using binary executable c program
> 
> I would suggest that you do the following to help you debug.
> 
> hadoop fs -cat /user/yehdego/RNAData/RF00028_B.bpseqL3G5_seg_Centered_Method.txt | head
-2 | /data/yehdego/hadoop-0.20.2/pknotsRG-1.3/src/pknotsRG -
> 
> This is simulating what hadoop streaming is doing.  Here we are taking the first 2 lines
out of the input file and feeding them to the stdin of pknotsRG.  The first step is to make
sure that you can get your program to run correctly with something like this.  You may need
to change the command line to pknotsRG to get it to read the data it is processing from stdin,
instead of from a file.  Alternatively you may need to write a shell script that will take
the data coming from stdin.  Write it to a file and then call pknotsRG on that temporary file.
 Once you have this working then you should try it again with streaming.
> 
> --Bobby Evans
> 
> On 7/22/11 12:31 PM, "Daniel Yehdego" <dtyehdego@miners.utep.edu> wrote:
> 
> 
> 
> Hi Bobby, Thanks for the response.
> 
> After I tried the following comannd:
> 
> bin/hadoop jar $HADOOP_HOME/hadoop-0.20.2-streaming.jar -mapper /data/yehdego/hadoop-0.20.2/pknotsRG-1.3/src/pknotsRG
-  -file /data/yehdego/hadoop-0.20.2/pknotsRG-1.3/src/pknotsRG  -reducer NONE -input /user/yehdego/RNAData/RF00028_B.bpseqL3G5_seg_Centered_Method.txt
-output /user/yehdego/RF-out - verbose
> 
> I got a stderr logs :
> 
> java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code
139
>         at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)
>         at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
>         at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:132)
>         at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
>         at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
>         at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
>         at org.apache.hadoop.mapred.Child.main(Child.java:170)
> 
> 
> 
> syslog logs
> 
> 2011-07-22 13:02:27,467 INFO org.apache.hadoop.metrics.jvm.JvmMetrics: Initializing JVM
Metrics with processName=MAP, sessionId=
> 2011-07-22 13:02:27,913 INFO org.apache.hadoop.mapred.MapTask: numReduceTasks: 0
> 2011-07-22 13:02:28,149 INFO org.apache.hadoop.streaming.PipeMapRed: PipeMapRed exec
[/data/yehdego/hadoop_tmp/dfs/local/taskTracker/jobcache/job_201107181535_0079/attempt_201107181535_0079_m_000000_0/work/./pknotsRG]
> 2011-07-22 13:02:28,242 INFO org.apache.hadoop.streaming.PipeMapRed: R/W/S=1/0/0 in:NA
[rec/s] out:NA [rec/s]
> 2011-07-22 13:02:28,267 INFO org.apache.hadoop.streaming.PipeMapRed: MROutputThread done
> 2011-07-22 13:02:28,267 INFO org.apache.hadoop.streaming.PipeMapRed: MRErrorThread done
> 2011-07-22 13:02:28,267 INFO org.apache.hadoop.streaming.PipeMapRed: PipeMapRed failed!
> 2011-07-22 13:02:28,361 WARN org.apache.hadoop.mapred.TaskTracker: Error running child
> java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code
139
>         at org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)
>         at org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
>         at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:132)
>         at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
>         at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
>         at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
>         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
>         at org.apache.hadoop.mapred.Child.main(Child.java:170)
> 2011-07-22 13:02:28,395 INFO org.apache.hadoop.mapred.TaskRunner: Runnning cleanup for
the task
> 
> 
> 
> Regards,
> 
> Daniel T. Yehdego
> Computational Science Program
> University of Texas at El Paso, UTEP
> dtyehdego@miners.utep.edu
> 
> > From: evans@yahoo-inc.com
> > To: common-user@hadoop.apache.org; dtyehdego@miners.utep.edu
> > Date: Fri, 22 Jul 2011 09:12:18 -0700
> > Subject: Re: Hadoop-streaming using binary executable c program
> >
> > It looks like it tried to run your program and the program exited with a 1 not a
0.  What are the stderr logs like for the mappers that were launched, you should be able to
access them through the Web GUI?  You might want to add in some stderr log messages to you
c program too. To be able to debug how far along it is going before exiting.
> >
> > --Bobby Evans
> >
> > On 7/22/11 9:19 AM, "Daniel Yehdego" <dtyehdego@miners.utep.edu> wrote:
> >
> > I am trying to parallelize some very long RNA sequence for the sake of
> > predicting their RNA 2D structures. I am using a binary executable c
> > program called pknotsRG as my mapper. I tried the following bin/hadoop
> > command:
> >
> > HADOOP_HOME$ bin/hadoop
> > jar /data/yehdego/hadoop-0.20.2/hadoop-0.20.2-streaming.jar
> > -mapper /data/yehdego/hadoop-0.20.2/pknotsRG
> > -file /data/yehdego/hadoop-0.20.2/pknotsRG
> > -input /user/yehdego/RF00028_B.bpseqL3G5_seg_Centered_Method.txt
> > -output /user/yehdego/RF-out -reducer NONE -verbose
> >
> > but i keep getting the following error message:
> >
> > java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess
> > failed with code 1
> >         at
> > org.apache.hadoop.streaming.PipeMapRed.waitOutputThreads(PipeMapRed.java:311)
> >         at
> > org.apache.hadoop.streaming.PipeMapRed.mapRedFinished(PipeMapRed.java:545)
> >         at org.apache.hadoop.streaming.PipeMapper.close(PipeMapper.java:132)
> >         at org.apache.hadoop.mapred.MapRunner.run(MapRunner.java:57)
> >         at org.apache.hadoop.streaming.PipeMapRunner.run(PipeMapRunner.java:36)
> >         at org.apache.hadoop.mapred.MapTask.runOldMapper(MapTask.java:358)
> >         at org.apache.hadoop.mapred.MapTask.run(MapTask.java:307)
> >         at org.apache.hadoop.mapred.Child.main(Child.java:170)
> >
> > FYI: my input file is RF00028_B.bpseqL3G5_seg_Centered_Method.txt which
> > is a chunk of RNA sequences and the mapper is expected to get the input
> > and execute the input file line by line and out put the predicted
> > structure for each line of sequence for a specified number of maps. Any
> > help on this problem is really appreciated. Thanks.
> >
> >
> 
> 
 		 	   		  
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